I have designed a 3D printable vaginal and anal Bipolar Conductive Rubber Electrode that I am calling my Bitter Pill. This version is made from hard-wearing yellow Nylon. This insulator has two lengths of 8"/20cm of 6mm conductive rubber tubing that takes 2mm plugs.

It features two loops, one for each orifice and the top of the electrode carries a raised "V" for the vagina and "A" for the anus, so you don't mix up the loops when you use them again. The sides of the electrodes feature two loops for attaching knicker elastic so you can secure it in place, but a pair of tight panties does the job just as well.

This extremely clever design has each side of a loop touching at the top to ensure smooth current flow but each electrode is isolated from the other, making this a bipolar electrode with one pole in each orifice.

It will be dispatched with 6mm conductive rubber tubing already fitted. Your TENS cable plugs can be secured to either end. You can even use either electrode loop as a base for tri-phase play by plugging a cable into each end. The sockets are labelled "V" and "A" at either end, so you know which loop you are connecting to.

Just plug in your 2mm plug and then insert it into your vagina and anus before switching on your control box and experiencing some e-stim pleasure.